Question

Frequency is most accurately measured using

• A. CRO
• B. Moving iron instrument
• C. Digital frequency counter
• D. PMMC

Hint:

Common applications: \[ \boxed{ \begin{aligned} \text{CRO} &\rightarrow \text{Waveform observation} \text{Digital frequency counter} &\rightarrow \text{Accurate frequency measurement} \end{aligned} } \]

Answer 1

The Correct Option is C

Step 1: Recall the function of a digital frequency counter. A digital frequency counter counts the number of cycles of an input signal during a precise time interval.

Step 2: Identify the most accurate instrument. Since it provides direct digital measurement with high accuracy, \[ \boxed{\text{Digital frequency counter}} \] is the most accurate instrument for measuring frequency. Therefore, \[ \boxed{(C)} \] is the correct answer.